<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>keyfranmes-animation</title>
    <style>
        div
        {
            width:100px;
            height:100px;
            background:red;
            position:relative;
            animation:myfirst 5s;
            -webkit-animation:myfirst 5s; /* Safari and Chrome */
        }

        @keyframes myfirst
        {
            0% {background: red; left: 0px; top:0px;}
            25% {background:yellow; left: 200px; top:0px;}
            50% {background:blue; left:200px; top:200px;}
            75% {background:green; left:0px; top:200px;}
            100% {background:red; left: 0px; top:0px;}
        }

        @-webkit-keyframes myfirst
        {
            0% {background: red; left: 0px; top:0px;}
            25% {background:yellow; left: 200px; top:0px;}
            50% {background:blue; left:200px; top:200px;}
            75% {background:green; left:0px; top:200px;}
            100% {background:red; left: 0px; top:0px;}
        }

    </style>
</head>
<body>

<p><b>注意：</b>该实例在Internet Explorer 9 及更早IE版本是无效的。</p>

<div></div>

</body>
</html>